<Feature> It is a multi-particle dresser which made of natural long needle-shaped diamond and synthetic diamond, it can replace of the forming dresser to dress slope forming molding sand. Their multi-layer structure can ensure to produce a constant edge in the process of using and there is no need to repair regularly. In addition, it corresponds to a variety of operations through adjusting the granularity of diamond and the hardness binding materials and the arrangement of diamond. Compared to single particle and forming dresser, it is of long life and low cost. <usage> mainly used for dressing profiled grinding, centerless grinding, segmented centerless grinding, segmented sub-cylindrical grinding wheel, and also applied for processing axle grinding wheel and sub-cylindrical grinding wheel.